If you must leave a placarded vehicle on a public roadway, what must be true?

• A. It is watched by a qualified person who will comply with all requirements
• B. It must be moved within 30 minutes
• C. It must be accompanied by a second driver
• D. It must be locked and unattended

Answer: (A)

When a placarded hazmat vehicle must be left on a public roadway, it has to be watched by a qualified person who will comply with all requirements. This ensures there’s someone responsible to maintain safety and enforce rules while the vehicle is stationary, such as keeping the load secure, ensuring placards remain visible, and addressing any safety concerns or violations that could arise.

The other options don’t meet that safeguard. There’s no requirement to move the vehicle within a set time, no mandate for a second driver to accompany, and leaving the vehicle locked and unattended does not satisfy the need for a qualified person to oversee compliance.